Number 133 (Story #1), June 17, 1993 by Phillip F. Schewe and Ben Stein THE WAVELIKE NATURE OF ELECTRONS at the surface of a copper crystal has been imaged with a scanning tunneling microscope (STM) by Donald Eigler and his colleagues at IBM Almaden. Looking like photos of the criss-crossing water waves arising from pebbles dropped in a pond, the STM images actually correspond to the patterns of quantum mechanical standing waves set up when an essentially two-dimensional electron gas (electrons trapped between a very high vacuum and a chilled, clean metal surface) scatters from a small number of imperfections in the crystal surface. (M.F. Crommie et al., Nature, 10 June 1993.)